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From: smagt@fwi.uva.nl (Patrick van der Smagt)
Newsgroups: comp.text.tex
Subject: Re: HELP! How to get bold $ \sigma $ ?
Message-ID: <1991May30.155826.4854@fwi.uva.nl>
Date: 30 May 91 15:58:26 GMT
References: <hong.675614987@galba>
Sender: news@fwi.uva.nl
Organization: FWI, University of Amsterdam
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hong@sci.kun.nl (Hong Zhou) writes:

>Hi, 
>I have been    trying to get bold $ \sigma $
>with $ {\bf \sigma} $ as well as $ {\boldmath   \sigma} $
>in LaTeX. But they don't work. Does anybody have 
>any idea? Any suggestion is welcome.

I use the following code for all my bold stuff (designed them myself
so much room for improvement):

\def\bm#1{%
  \mathchoice%
       {\setbox1=\hbox{$#1$}\dobm}
       {\setbox1=\hbox{$#1$}\dobm}
       {\setbox1=\hbox{\scriptsize$#1$}\dobm}
       {\setbox1=\hbox{\tiny$#1$}\dobm}
}
\def\dobm{
    \copy1\kern-\wd1\kern0.05ex\copy1\kern-\wd1\kern0.05ex\box1
}



So you can do the following:

$$
	\bm{\displaystyle\sum_{i=0}^N} ...
$$

						Patrick van der Smagt